Data fetch from API not showing on recyclerview MVVM kotlin - kotlin

Question

I got blocked for this problem, Api will call and get the objects from the response and it will display on the recyclerview. But it is not showing,
fetchProductCategories will do the api call.
prepareProducts will handle the fetched from fetchProductCategories
Fragment:
#AndroidEntryPoint
class ProductsWelcomeFragment : BaseProductsFragment<ProductsWelcomeViewModel, ProductsWelcomeFragmentBinding>() {
private val TAG = "ProductsWelcomeFragment"
#Inject
lateinit var animationQueue: AnimationQueue
override fun getViewModelClass(): KClass<ProductsWelcomeViewModel> = ProductsWelcomeViewModel::class
override fun getContentViewRes(): Int = R.layout.products_welcome_fragment
private val cordovaViewModel: CordovaViewModel by activityViewModels()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
/**
* Initialize only once when everytime accessing products screen.
* */
sharedViewModel.initialSetUpRequest()
viewModel.fetchProductCategories()
}
override fun onBindView() {
with(dataBinding) {
viewModel = this#ProductsWelcomeFragment.viewModel
title = getString(R.string.products_screen_welcome_header)
recyclerViewProducts.configure()
executePendingBindings()
}
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
viewModel.productCategoriesLiveData.observe(viewLifecycleOwner) {
Log.i(TAG, it.toString())
viewModel.items.observe(viewLifecycleOwner) {
viewModel.prepareProducts()
}
}
viewModel.showProgress.observe(viewLifecycleOwner) {}
viewModel.failedAtRetrievingData.observe(viewLifecycleOwner) {
// showErrorScreen(true)
}
}
private fun RecyclerView.configure() {
with(dataBinding.recyclerViewProducts) {
addItemBindings(SectionHeaderItemViewBinder)
addItemBindings(SpaceItemViewDtoBinder)
addItemBindings(getListButtonItemViewBinder(ProductItem.NormalProduct::dto, ::onProductItemClick))
addItemBindings(getListBigtileItemViewBinder(ProductItem.FeaturedProduct::dto, ::onProductItemClick))
}
}
private fun onProductItemClick(product: ProductItem.NormalProduct) {
when (product.id) {
else -> { // TODO : )}
}
// TODO : implement move to another screen
}
private fun onProductItemClick(product: ProductItem.FeaturedProduct) {
// TODO : implement move to another screen
}
private fun showErrorScreen(isDataRetrievalError: Boolean) {
val dismissAction = ErrorHandlingAction(
getString(R.string.native_done),
null,
null,
ButtonType.PRIMARY
) { dismissDialog ->
dismissDialog.dismiss()
if (isDataRetrievalError) {
findNavController().popBackStack()
}
}
DialogFactory().showBottomDialog(
fragmentManager = parentFragmentManager,
window = requireActivity().window,
title = getString(R.string.native_error_title),
description = getString(R.string.online_identity_something_went_wrong_error_description),
iconId = R.drawable.ic_error_thick_exclamation_icon,
errorHandlingActions = arrayOf(dismissAction),
isHtmlDescription = true
)
}
private fun openCordovaScreen(destination: CordovaPage) {
cordovaViewModel.requestPage(destination)
findNavController().popBackStack(R.id.homeScreenMainFragment, false)
}
}
ViewModel:
#HiltViewModel
class ProductsWelcomeViewModel #Inject constructor(
private val productsRepository: ProductsRepository
) : BaseRequestViewModel(), ViewModelWithItems {
private val TAG = "ProductsWelcomeViewModel"
private val _failedAtRetrievingData = SingleLiveEvent<Boolean>()
val failedAtRetrievingData: LiveData<Boolean> = _failedAtRetrievingData
private val _showProgress = MutableLiveData<Boolean>()
val showProgress: LiveData<Boolean> = _showProgress
private val onProductCategories: SingleLiveEvent<ProductBasketsCategoriesModel?> = SingleLiveEvent()
val productCategoriesLiveData: LiveData<ProductBasketsCategoriesModel?> = onProductCategories
private val _items: MutableLiveData<List<Any>> = MutableLiveData()
override val items: LiveData<List<Any>> = _items
fun fetchProductCategories() {
viewModelScope.launch {
request({ productsRepository.getProductCategories() },
success = { response -> onProductCategories.value = response },
failure = { })
}
}
fun prepareProducts() {
_items.value = mutableListOf<Any>().apply {
productCategoriesLiveData.value?.embedded?.categories?.filter { categories ->
categories.isFeatured == true }?.let { filteredCategories ->
add(HeaderItem(ListSectionHeaderItemViewDto(
text = TextLine(
textRes = if (filteredCategories.isNotEmpty()) {
R.string.products_screen_welcome_header } else { null }
)
)
))
filteredCategories.toItems()?.let { addAll(it) }
}
productCategoriesLiveData.value?.embedded?.categories?.filter { categories ->
categories.isFeatured == false }.let { filteredCategories ->
if (filteredCategories != null) {
add(HeaderItem(ListSectionHeaderItemViewDto(
text = TextLine(
textRes = if (filteredCategories.isNotEmpty()) {
R.string.products_screen_welcome_header } else { null }
)
)
))
}
filteredCategories.toItems()?.let { addAll(it) }
}
}
}
private fun List<CategoriesItemModel>?.toItems(): List<ProductItem>? =
this?.mapIndexed { index, item ->
if (item.isFeatured == true) {
ProductItem.FeaturedProduct(
id = item.id as Any,
name = item.name,
dto = BigTileDto(
title = TextLine(text = item.name),
image = item.id.toString().let { toFeatureIcon(it, item.isFeatured) },
description = TextLine(item.description.toString()),
background = BackgroundType.SINGLE
)
)
} else {
ProductItem.NormalProduct(
id = item.id as Any,
name = item.name,
dto = ListButtonItemViewDto(
firstLine = TextLine(text = item.name),
rightDrawable = R.drawable.ic_arrow_right,
separatorDrawable = R.drawable.list_divider_margin_start_72dp,
background = index.indexToBackgroundType(this.size),
avatarDto = AvatarDto(iconBackgroundColor = R.color.ubs_concrete, avatarSize = AvatarDto.AvatarSize.SMALL_ICON_SIZE, iconId = toFeatureIcon(
item.id, item.isFeatured
)),
)
)
}
}
private fun toFeatureIcon(id: String?, isFeature: Boolean?): Int = if (ProductFeature.verify(id) == true) {
ProductFeature.icon()
} else { if (isFeature == true) { R.drawable.abc_vector_test } else {
R.drawable.balloon_illustration } }
}